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English definition of “not in a month of Sundays”

not in a month of Sundays

If you say that something will not happen in a month of Sundays, you mean that it is very unlikely to happen: He's never going to get that finished in a month of Sundays!
(Definition of not in a month of Sundays from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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Translations of “not in a month of Sundays”

SMART Thesaurus: Long periods of time

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